249878731 has 2 divisors, whose sum is σ = 249878732. Its totient is φ = 249878730.

The previous prime is 249878689. The next prime is 249878773. The reversal of 249878731 is 137878942.

It is a balanced prime because it is at equal distance from previous prime (249878689) and next prime (249878773).

It is a cyclic number.

It is not a de Polignac number, because 249878731 - 2⁹ = 249878219 is a prime.

It is a super-2 number, since 2×249878731² = 124878760412340722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249878791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124939365 + 124939366.

It is an arithmetic number, because the mean of its divisors is an integer number (124939366).

Almost surely, 2^249878731 is an apocalyptic number.

249878731 is a deficient number, since it is larger than the sum of its proper divisors (1).

249878731 is an equidigital number, since it uses as much as digits as its factorization.

249878731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The square root of 249878731 is about 15807.5529731834. The cubic root of 249878731 is about 629.8586488959.

The spelling of 249878731 in words is "two hundred forty-nine million, eight hundred seventy-eight thousand, seven hundred thirty-one".